A student wrote that a candle went out quickly. What should be recorded to make the observation more precise?

Correct answer: Time taken to go out

The direct answer is B: record the time taken for the candle to go out. The word “quickly” is vague because different people may understand it differently. A precise observation uses something that can be measured and checked by another person. Step by step: start the timer when the candle is lit or when the stated event begins; stop it when the flame goes out; record the value, such as seconds or minutes, and keep the conditions clear. Option B is correct because time changes an unclear description into quantitative evidence. Option A is wrong because favourite colour does not tell when the candle went out. Option C is wrong because the student's feeling is subjective and cannot measure the event. Option D is wrong because room beauty is unrelated to the candle's extinction time. Memory cue: replace words such as quickly, brightly, or large with a number or a clear measurement.